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(a) Biosynthesis of PGH2 from AA by COX. (b) Proposed mechanism of enzyme-catalyzed resorufin production by COX via a CoxFluor-PGG2 intermediate via either Compound I (π cationic porphyrin radical) or Compound II (oxyferryl). The reaction between two CoxFluor-PGG2 intermediate radicals, dismutation, and hydrolysis are omitted for simplicity.
